Move FileEnumerator to its own file, do some refactoring.

webkit/plugins/npapi/plugin_list_mac.mm

Index: webkit/plugins/npapi/plugin_list_mac.mm
diff --git a/webkit/plugins/npapi/plugin_list_mac.mm b/webkit/plugins/npapi/plugin_list_mac.mm
index 66f32960540e18761fa11f60149a5ff89c46a0a8..922962a43e512813923720f013bfc10987dda527 100644
--- a/webkit/plugins/npapi/plugin_list_mac.mm
+++ b/webkit/plugins/npapi/plugin_list_mac.mm
@@ -7,6 +7,7 @@
 #import <Foundation/Foundation.h>
 
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/mac/mac_util.h"
 #include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
@@ -78,9 +79,9 @@ void PluginList::GetPluginDirectories(std::vector<base::FilePath>* plugin_dirs)
 
 void PluginList::GetPluginsInDir(
     const base::FilePath& path, std::vector<base::FilePath>* plugins) {
-  file_util::FileEnumerator enumerator(path,
-                                       false, // not recursive
-                                       file_util::FileEnumerator::DIRECTORIES);
+  base::FileEnumerator enumerator(path,
+                                  false, // not recursive
+                                  base::FileEnumerator::DIRECTORIES);
   for (base::FilePath path = enumerator.Next(); !path.value().empty();
        path = enumerator.Next()) {
     plugins->push_back(path);